Time-Reversed Particle-Vibration Loops and Nuclear Gamow-Teller Response

The nuclear response theory for charge-exchange modes in the relativistic particle-vibration coupling approach is extended to include for the first time particle-vibration coupling effects in the ground state of the parent nucleus. In a framework based on the effective meson-nucleon Lagrangian, we i...

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Bibliographic Details
Published in:Physical review letters 2019-11, Vol.123 (20), p.202501-202501, Article 202501
Main Authors: Robin, Caroline, Litvinova, Elena
Format: Article
Language:English
Subjects:
Admixtures
Charge exchange
Correlation
Coupling
NUCLEAR PHYSICS AND RADIATION PHYSICS
Nucleons
Physics
Relativistic particles
Vibration
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Summary:The nuclear response theory for charge-exchange modes in the relativistic particle-vibration coupling approach is extended to include for the first time particle-vibration coupling effects in the ground state of the parent nucleus. In a framework based on the effective meson-nucleon Lagrangian, we investigate the role of such complex ground-state correlations in the description of Gamow-Teller transitions in ^{90}Zr in both (p, n) and (n, p) channels. The particle-vibration coupling effects are calculated without introducing new parameters. We find that this new correlation mechanism is fully responsible for the appearance of the strength in the (n, p) branch. Comparison of our results to the available experimental data shows a very good agreement up to excitation energies beyond the giant resonance region when taking into account a phenomenological admixture of the isovector spin monopole transitions. The parent-daughter binding-energy differences are also greatly improved by the inclusion of the new correlations.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.123.202501